Atmospheric Composition

The Copernicus Sentinel-3 mission includes key optical instruments allowing to monitor operationally the composition of our atmosphere for air quality and climate purposes.

The Sea and Land Surface Temperature Radiometer (SLSTR) is a dual-view sensor with several channels of interest for hotspot and aerosol observations.

Two SLSTR Level-2 atmospheric products are available: the Near Real Time (NRT) Fire Radiative Power (FRP) product and the NRT Aerosol Optical Depth (AOD) product.

NRT FRP Product

The SLSTR Near Real Time (NRT) Fire Radiative Power (FRP) product, implemented by EUMETSAT, identifies the location, and quantifies the radiative power, of any hotspot present on land and ocean Earth surfaces, that radiates a heating signal within a pixel size of 1 km2.

Figure 1
 
Figure 1: Example of the NRT FRP Product showing hotspots
 

All threatening hotspots, i.e. agricultural burning, wildfires, deforestation, tropical peatland fires, industrial gas flares, and volcanoes, are identified and characterised in less than three hours from the SLSTR observation sensing time.

NRT AOD Product

The SLSTR Near Real Time (NRT) Aerosol Optical Depth (AOD) product quantifies the abundance of aerosol particles, and monitors their global distribution and long-range transport, at the scale of 9.5 x 9.5 km2. All observations are made available in less than 3 hours from the SLSTR observation sensing time. It is only applicable during daytime.

Figure 2
 
Figure 2: Example of the NRT AOD product. Dust aerosol transport from the Gobi desert over urban areas in Eastern China and the Yellow Sea on 12 May 2020.
 

The current NRT AOD product is the first release as Baseline Collection 1.

NOTE: There are different maturity statuses between ocean and land surfaces where:

  • AOD Ocean is pre-operational
  • AOD Land is currently demonstrational

Further improvements to the NRT AOD product are planned, including the optimisation of the spectral constraints over land continents in case of unfavourable dual-view geometry, a comprehensive global validation, and additional updates following feedback from selected Sentinel-3 NRT atmosphere experts.

These data are very important to improving our knowledge on aerosol and gas emissions. It is planned that they will be used operationally by the Copernicus Atmosphere Monitoring Service (CAMS), as well as by other entities involved in air quality and climate monitoring.

Both AOD and FRP are essential climate variables. Improving aerosol knowledge is also essential for enhancing the quality of other satellite datasets focused on surface applications, such as Ocean Colour.

Full details on the SLSTR Near Real Time (NRT) Fire Radiative Power (FRP) product

Full details on the SLSTR Near Real Time (NRT) Aerosol Optical Depth (AOD) product

Available SLSTR Level 1 data
Name Instrument Data Access
SLSTR Level 1B Radiances and Brightness Temperatures in NRT - Sentinel-3 SLSTR Copernicus Online Data Access (CODA),
EUMETSAT Data Centre,
EUMETCast-Terrestrial
 

Product notices

Product Date in Operations Baseline Collection IPF (Instrument Processing Facility) Version EUMETSAT Processing Baseline Version Product Notice Comments
SLSTR L2 NRT Aerosol Optical Depth (AOD) 19 August 2020 1 2.0 S3A and S3B: 2.70 Sentinel-3 Product Notice – SLSTR Level-2 Near Real Time Aerosol Optical Depth  
SLSTR L2 NRT Fire Radiative Power (FRP) 16 July 2020 1 2.0 S3A and S3B: 2.69 Sentinel-3 Product Notice – SLSTR Level-2 Near Real Time Fire Radiative Power Updated to remove twilight in the high latitude areas
SLSTR L2 NRT Fire Radiative Power (FRP) 08 April 2020 1 2.0 S3A & S3B: 2.64 Sentinel-3 Product Notice – SLSTR Level-2 Near Real Time Fire Radiative Power  
 

Users need to be registered to get access to these products. To do this you need to use our Earth Observation Portal (EOP). To access the Earth Observation Portal (EOP) for the first time, users need to create an account. Once the account has been created, you can log in to view and modify your profile, service subscriptions and licence arrangements.

Register with EOP

NRT FRP and AOD products are available:

All Sentinel data products are distributed using a Sentinel-specific variation of the Standard Archive Format for Europe (SAFE) format specification. The information is contained in a single package, with objects encoded in NetCDF format.

Full details can be found on the Sentinel Data Formats page.

Collecting your feedback — Additional available online and offline data

NRT FRP Product

All public users can look at the daily monitoring of FRP hotspot situations from S3A and S3B via the EUMETSAT Monitoring & Evaluation of Thematic Information from Space (METIS) FRP webpage.

In addition, a series of S3 FRP dataset produced off-line from the same EUMETSAT processor v2.0 can be made available upon request via our User Service Helpdesk.

This includes the following:

  • Complete worldwide reprocessing of past S3 FRP dataset up to 1 December 2019, based on the 'Full F1 Off' configuration, similar to the current reference NRT configuration disseminated operationally.
  • Complete worldwide reprocessing of past (up to 1 December 2019) and present S3 FRP dataset, based on the 'Full F1 On' configuration. Users are advised this configuration is currently under evaluation, and not yet part of the reference NRT configuration. However, any user is welcome to evaluate it and give feedback.
  • Specific regionally and/or temporally limited reprocessing may be addressed.
  • Possible, other ancillary data and/or expert advice support.

NRT AOD Product

A series of S3 NRT AOD dataset produced off-line from SLSTR L1B NRT with the same EUMETSAT processor v2.0 can be made available upon request via our User Service Helpdesk. This includes the following:

  • Global reprocessing of a couple of months in 2019 and 2020.
  • Specific regionally and/or temporally limited reprocessing may be addressed upon user request.
  • Possible other ancillary data and/or expert advice support.

Overall, EUMETSAT welcomes feedback from users at any time via the User Service Helpdesk.

 

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